*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    text-decoration: none;
    list-style: none;
}
.clearfix:before,
.clearfix:after{
    content: "";
    clear: both;
    display: block;
}

/****样式部分****/
#app{
    padding: 15px 35px;
}
#app ul li{
    float: left;
    width: 140px;
    margin-bottom: 5px;
}
ul li a{
    color: #555;
    font-size: 14px;
    margin-left: 5px;
}
ul li:nth-child(12) a{
    color: #ff5500;
}
ul li:nth-child(25) a{
    color: #ff5500;
}